Note---Comment on "A Perturbation Scheme to Improve Hillier's Solution to the Facilities Layout Problem"

This note points out that three of the facilities layout problems solved by Picone and Wilhelm (Picone, C. J., W. E. Wilhelm. 1984. A perturbation scheme to improve Hillier's solution to the facilities layout problem. Management Sci. 30 1238--1249.) are different from the test problems given in Nugent, Vollmann and Ruml (Nugent, C. E., T. E. Vollmann, J. Ruml. 1968. An experimental comparison of techniques for the assignment of facilities to locations. Oper. Res. 16 150--173.). Comparison with results obtained by other researchers to these test problems is, therefore, not valid.